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[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [dskctl.s] - Blame information for rev 183

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;
; dskctl.s -- disk made available by disk controller
;
 
;***************************************************************
 
        .set    dskbase,0xF0400000      ; disk base address
        .set    dskctrl,0                ; control register
        .set    dskcnt,4                ; count register
        .set    dsksct,8                ; sector register
        .set    dskcap,12               ; capacity register
        .set    dskbuf,0x00080000       ; disk buffer
 
        .set    ctrlstrt,0x01           ; start bit
        .set    ctrlien,0x02            ; interrupt enable bit
        .set    ctrlwrt,0x04            ; write bit
        .set    ctrlerr,0x08            ; error bit
        .set    ctrldone,0x10           ; done bit
        .set    ctrlrdy,0x20            ; ready bit
 
        .set    sctsize,512             ; sector size in bytes
 
        .set    retries,1000000         ; retries to get disk ready
 
        .export dskinit                 ; initialize disk
        .export dskcapctl               ; determine disk capacity
        .export dskioctl                ; do disk I/O
 
;***************************************************************
 
        .code
        .align  4
 
dskinit:
        jr      $31
 
dskcapctl:
        add     $8,$0,retries            ; set retry count
        add     $9,$0,dskbase
dskcap1:
        ldw     $10,$9,dskctrl
        and     $10,$10,ctrlrdy         ; ready?
        bne     $10,$0,dskcapok          ; yes - jump
        sub     $8,$8,1
        bne     $8,$0,dskcap1            ; try again
        add     $2,$0,0                   ; no disk found
        j       dskcapx
dskcapok:
        ldw     $2,$9,dskcap            ; get disk capacity
dskcapx:
        jr      $31
 
dskioctl:
        sub     $29,$29,24
        stw     $31,$29,20
        stw     $16,$29,16
        stw     $17,$29,12
        stw     $18,$29,8
        stw     $19,$29,4
        stw     $20,$29,0
        add     $16,$4,$0                ; command
        add     $17,$5,$0                ; sector number
        add     $18,$6,0xC0000000       ; memory address, virtualized
        add     $19,$7,$0                ; number of sectors
 
        add     $8,$0,'r'
        beq     $16,$8,dskrd
        add     $8,$0,'w'
        beq     $16,$8,dskwr
        add     $2,$0,0xFF               ; illegal command
        j       dskx
 
dskrd:
        add     $2,$0,$0          ; return ok
        beq     $19,$0,dskx              ; if no (more) sectors
        add     $8,$0,dskbase
        add     $9,$0,1
        stw     $9,$8,dskcnt            ; number of sectors
        stw     $17,$8,dsksct           ; sector number on disk
        add     $9,$0,ctrlstrt
        stw     $9,$8,dskctrl           ; start command
dskrd1:
        ldw     $2,$8,dskctrl
        and     $9,$2,ctrldone          ; done?
        beq     $9,$0,dskrd1             ; no - wait
        and     $9,$2,ctrlerr           ; error?
        bne     $9,$0,dskx               ; yes - leave
        add     $8,$0,dskbase + dskbuf   ; transfer data
        add     $9,$0,sctsize
dskrd2:
        ldw     $10,$8,0         ; from disk buffer
        stw     $10,$18,0                ; to memory
        add     $8,$8,4
        add     $18,$18,4
        sub     $9,$9,4
        bne     $9,$0,dskrd2
        add     $17,$17,1               ; increment sector number
        sub     $19,$19,1               ; decrement number of sectors
        j       dskrd                   ; next sector
 
dskwr:
        add     $2,$0,$0          ; return ok
        beq     $19,$0,dskx              ; if no (more) sectors
        add     $8,$0,dskbase + dskbuf   ; transfer data
        add     $9,$0,sctsize
dskwr1:
        ldw     $10,$18,0                ; from memory
        stw     $10,$8,0         ; to disk buffer
        add     $18,$18,4
        add     $8,$8,4
        sub     $9,$9,4
        bne     $9,$0,dskwr1
        add     $8,$0,dskbase
        add     $9,$0,1
        stw     $9,$8,dskcnt            ; number of sectors
        stw     $17,$8,dsksct           ; sector number on disk
        add     $9,$0,ctrlwrt | ctrlstrt
        stw     $9,$8,dskctrl           ; start command
dskwr2:
        ldw     $2,$8,dskctrl
        and     $9,$2,ctrldone          ; done?
        beq     $9,$0,dskwr2             ; no - wait
        and     $9,$2,ctrlerr           ; error?
        bne     $9,$0,dskx               ; yes - leave
        add     $17,$17,1               ; increment sector number
        sub     $19,$19,1               ; decrement number of sectors
        j       dskwr                   ; next sector
 
dskx:
        ldw     $20,$29,0
        ldw     $19,$29,4
        ldw     $18,$29,8
        ldw     $17,$29,12
        ldw     $16,$29,16
        ldw     $31,$29,20
        add     $29,$29,24
        jr      $31

Line No.	Rev	Author	Line
1	59	hellwig	`;`
2	182	hellwig	`; dskctl.s -- disk made available by disk controller`
3	59	hellwig	`;`
4
5			`;***************************************************************`
6
7			`.set dskbase,0xF0400000 ; disk base address`
8			`.set dskctrl,0 ; control register`
9			`.set dskcnt,4 ; count register`
10			`.set dsksct,8 ; sector register`
11			`.set dskcap,12 ; capacity register`
12			`.set dskbuf,0x00080000 ; disk buffer`
13
14			`.set ctrlstrt,0x01 ; start bit`
15			`.set ctrlien,0x02 ; interrupt enable bit`
16			`.set ctrlwrt,0x04 ; write bit`
17			`.set ctrlerr,0x08 ; error bit`
18			`.set ctrldone,0x10 ; done bit`
19			`.set ctrlrdy,0x20 ; ready bit`
20
21			`.set sctsize,512 ; sector size in bytes`
22
23			`.set retries,1000000 ; retries to get disk ready`
24
25	182	hellwig	`.export dskinit ; initialize disk`
26			`.export dskcapctl ; determine disk capacity`
27			`.export dskioctl ; do disk I/O`
28	59	hellwig
29			`;***************************************************************`
30
31			`.code`
32			`.align 4`
33
34	182	hellwig	`dskinit:`
35			`jr $31`
36
37			`dskcapctl:`
38	59	hellwig	`add $8,$0,retries ; set retry count`
39			`add $9,$0,dskbase`
40	182	hellwig	`dskcap1:`
41	59	hellwig	`ldw $10,$9,dskctrl`
42			`and $10,$10,ctrlrdy ; ready?`
43	182	hellwig	`bne $10,$0,dskcapok ; yes - jump`
44	59	hellwig	`sub $8,$8,1`
45	182	hellwig	`bne $8,$0,dskcap1 ; try again`
46	59	hellwig	`add $2,$0,0 ; no disk found`
47	182	hellwig	`j dskcapx`
48			`dskcapok:`
49	59	hellwig	`ldw $2,$9,dskcap ; get disk capacity`
50	182	hellwig	`dskcapx:`
51	59	hellwig	`jr $31`
52
53	182	hellwig	`dskioctl:`
54	59	hellwig	`sub $29,$29,24`
55			`stw $31,$29,20`
56			`stw $16,$29,16`
57			`stw $17,$29,12`
58			`stw $18,$29,8`
59			`stw $19,$29,4`
60			`stw $20,$29,0`
61			`add $16,$4,$0 ; command`
62			`add $17,$5,$0 ; sector number`
63			`add $18,$6,0xC0000000 ; memory address, virtualized`
64			`add $19,$7,$0 ; number of sectors`
65
66			`add $8,$0,'r'`
67	182	hellwig	`beq $16,$8,dskrd`
68	59	hellwig	`add $8,$0,'w'`
69	182	hellwig	`beq $16,$8,dskwr`
70	59	hellwig	`add $2,$0,0xFF ; illegal command`
71	182	hellwig	`j dskx`
72	59	hellwig
73	182	hellwig	`dskrd:`
74	59	hellwig	`add $2,$0,$0 ; return ok`
75	182	hellwig	`beq $19,$0,dskx ; if no (more) sectors`
76	59	hellwig	`add $8,$0,dskbase`
77			`add $9,$0,1`
78			`stw $9,$8,dskcnt ; number of sectors`
79			`stw $17,$8,dsksct ; sector number on disk`
80			`add $9,$0,ctrlstrt`
81			`stw $9,$8,dskctrl ; start command`
82	182	hellwig	`dskrd1:`
83	59	hellwig	`ldw $2,$8,dskctrl`
84			`and $9,$2,ctrldone ; done?`
85	182	hellwig	`beq $9,$0,dskrd1 ; no - wait`
86	59	hellwig	`and $9,$2,ctrlerr ; error?`
87	182	hellwig	`bne $9,$0,dskx ; yes - leave`
88	59	hellwig	`add $8,$0,dskbase + dskbuf ; transfer data`
89			`add $9,$0,sctsize`
90	182	hellwig	`dskrd2:`
91	59	hellwig	`ldw $10,$8,0 ; from disk buffer`
92			`stw $10,$18,0 ; to memory`
93			`add $8,$8,4`
94			`add $18,$18,4`
95			`sub $9,$9,4`
96	182	hellwig	`bne $9,$0,dskrd2`
97	59	hellwig	`add $17,$17,1 ; increment sector number`
98			`sub $19,$19,1 ; decrement number of sectors`
99	182	hellwig	`j dskrd ; next sector`
100	59	hellwig
101	182	hellwig	`dskwr:`
102	59	hellwig	`add $2,$0,$0 ; return ok`
103	182	hellwig	`beq $19,$0,dskx ; if no (more) sectors`
104	59	hellwig	`add $8,$0,dskbase + dskbuf ; transfer data`
105			`add $9,$0,sctsize`
106	182	hellwig	`dskwr1:`
107	59	hellwig	`ldw $10,$18,0 ; from memory`
108			`stw $10,$8,0 ; to disk buffer`
109			`add $18,$18,4`
110			`add $8,$8,4`
111			`sub $9,$9,4`
112	182	hellwig	`bne $9,$0,dskwr1`
113	59	hellwig	`add $8,$0,dskbase`
114			`add $9,$0,1`
115			`stw $9,$8,dskcnt ; number of sectors`
116			`stw $17,$8,dsksct ; sector number on disk`
117			`add $9,$0,ctrlwrt \| ctrlstrt`
118			`stw $9,$8,dskctrl ; start command`
119	182	hellwig	`dskwr2:`
120	59	hellwig	`ldw $2,$8,dskctrl`
121			`and $9,$2,ctrldone ; done?`
122	182	hellwig	`beq $9,$0,dskwr2 ; no - wait`
123	59	hellwig	`and $9,$2,ctrlerr ; error?`
124	182	hellwig	`bne $9,$0,dskx ; yes - leave`
125	59	hellwig	`add $17,$17,1 ; increment sector number`
126			`sub $19,$19,1 ; decrement number of sectors`
127	182	hellwig	`j dskwr ; next sector`
128	59	hellwig
129	182	hellwig	`dskx:`
130	59	hellwig	`ldw $20,$29,0`
131			`ldw $19,$29,4`
132			`ldw $18,$29,8`
133			`ldw $17,$29,12`
134			`ldw $16,$29,16`
135			`ldw $31,$29,20`
136			`add $29,$29,24`
137			`jr $31`

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[/] [eco32/] [trunk/] [monitor/] [monitor/] [common/] [dskctl.s] - Blame information for rev 183